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Preparation method of low-odor polymer emulsion

A polymer emulsion, low odor technology, applied in the fields of instruments, optics, electrical recording, etc., can solve the problems of easy odor emission and high free mercaptan content, and achieve the effect of reducing odor, simple process and low cost

Active Publication Date: 2013-05-22
鼎龙(宁波)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of preparation method of low-odor polymer emulsion to the art, make it solve the free mercaptan content in the copolymer emulsion when the existing preparation polymer emulsion adopts high boiling point mercaptan as molecular weight regulator , the problem of easy odor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a 5000ml four-neck reaction flask equipped with a stirring motor, reflux condenser, thermometer and dropping funnel, add 2000ml deionized water, 15.0g lauryl polyoxyethylene ether acetic acid, adjust the pH value to 8.0 with ammonia water, add 135.0g benzene Ethylene, 40.4g n-butyl acrylate, 3.6g hydroxyethyl methacrylate, 1.0g acrylic acid and 3.6g n-dodecanethiol, start stirring, heat the mixture to 85°C, add 15.0g 25% persulfuric acid Ammonium aqueous solution was reacted for 1 hour to prepare a seed emulsion. Then 1215.0g styrene, 363.6g butyl acrylate, 32.4g hydroxyethyl methacrylate, 9.0g acrylic acid and 32.4g n-dodecanethiol were mixed uniformly as mixed monomers, and 35.0g lauryl alcohol polyoxyethylene ( 10) Dissolve ether acetic acid in 700ml of deionized water, adjust the pH value to 8.0 with ammonia water, add 45g of 25% ammonium persulfate aqueous solution, stir well, and prepare a pre-emulsion. After the seed emulsion is polymerized, add the pre-emuls...

Embodiment 2

[0033] In the 500ml reaction bottle that is equipped with stirring motor, reflux condenser and thermometer, add the emulsion A that makes in 400g embodiment 1, add 0.2g sulfonated cobalt phthalocyanine and 8ml concentration and be 30% hydrogen peroxide aqueous solution, at 85 The reaction was stirred at °C for 3 hours. Distillation under reduced pressure was carried out after the reaction was completed, and the distillation was stopped at 5 kPa and 90° C. for 3 hours. The reactant was cooled, filtered, and the solid content was measured, and the solid content was adjusted to 40.0% with deionized water. The prepared emulsion was designated as C, and the emulsion had only a slight characteristic odor of n-dodecanethiol.

[0034] In a 1500ml reactor, add 210.0g emulsion C, 34.0g carbon black aqueous dispersion stabilized by anionic emulsifier (solid content 30%, volume average particle diameter D V 50 is 120nm), 20.0g carnauba wax emulsion stabilized by anionic emulsifier (solid...

Embodiment 3

[0037] In the 500ml reaction bottle that is equipped with stirring motor, reflux condenser and thermometer, add the emulsion A that makes in 400g embodiment 1, add 0.2g sulfonated cobalt phthalocyanine and 10ml concentration and be 30% peroxyacetic acid aqueous solution, at 85 The reaction was stirred at °C for 3 hours. Distillation under reduced pressure was carried out after the reaction was completed, and the distillation was stopped at 5 kPa and 90° C. for 4 hours. The reactant was cooled, filtered, and the solid content was measured. The solid content was adjusted to 40.0% with deionized water. The prepared emulsion was marked as D, and the emulsion had only a slight characteristic odor of n-dodecanethiol.

[0038] In a 1500ml reactor, add 210.0g emulsion D, 34.0g carbon black aqueous dispersion stabilized by anionic emulsifier (solid content 30%, volume average particle diameter D V 50 is 120nm), 20.0g carnauba wax emulsion stabilized by anionic emulsifier (solid conten...

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Abstract

The invention relates to a preparation method of a low-odor polymer emulsion, and is designed to solve the problems that the free mercaptan content in a copolymer emulsion is high and the copolymer emulsion easily sends out peculiar odor in the existing polymer emulsion preparation process using high-boiling-point mercaptan as molecular weight regulator. The method comprises the following steps: in the presence of emulsifier, initiator, pH buffer and mercaptan molecular weight regulator, performing emulsion polymerization on a vinyl monomer, an acrylate monomer and a functional monomer among alkenyl unsaturated monomers; and finally, performing reduced pressure distillation or steam distillation on the emulsion. The method is characterized in that after the emulsion polymerization reaction, a catalyst and peroxide are added, so that the unreacted free mercaptan in the polymer emulsion is converted into an odorless product. The prepared low-odor polymer emulsion can be used as ink powder for printers or duplicators. The technical process provided by the invention is simple and low in cost, can effectively reduce the peculiar odor of the polymer emulsion, and is suitable for serving as a preparation method of a low-odor polymer emulsion or an improvement of a similar method.

Description

technical field [0001] The invention relates to the preparation of a polymer emulsion, which is a preparation method of a low-odor polymer emulsion. Background technique [0002] Polymer is a widely used material, and its performance is mainly determined by its molecular structure, molecular weight and distribution, and aggregated structure. In practical applications, in order to meet specific performance requirements, the molecular weight of polymers needs to be regulated. [0003] To accommodate high-speed, low-temperature fusing, electrostatic toners require lower molecular weight polymers to provide suitable melt viscosity, melt rheology, viscoelasticity, and gel elimination. Generally, the number average molecular weight is controlled at 5000-20000. There are many ways to synthesize low-molecular-weight polymers, ① increase the amount of initiator; ② use the method of increasing the temperature; ③ use the method of reversible addition-fragmentation chain transfer poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/02C08F212/08C08F220/18C08F220/28C08F220/06C08F2/38C08F6/14G03G9/08
Inventor 管爱国吴国章陈全吉
Owner 鼎龙(宁波)新材料有限公司
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